Sheriffs Police

The Cook County Sheriff’s Police Department is the third largest police department in the State of Illinois, with more than 500 officers and 100 civilian personnel. The department’s primary responsibility, as mandated by the state constitution, is to provide basic police services to the 109,000 residents who work and reside in the unincorporated areas of the county. These 72 square miles are sporadically pocketed in between the 128 municipalities and within the 946 square miles that are encompassed by the borders of Cook County.

Additionally, the Sheriff’s Police has several specialized units that provide services to suburban police departments on a mutual aid basis.